(As) Poor as a Church Mouse - Common English Idiom

I have no money. I just spent all of my savings to pay my credit card bill. I'm poor as a church mouse. A: If everyone pitches in $5 we can get a new coffee machine for the break room. B: Don’t bother asking Bob, he’s as poor as a church mouse. The phrasal verb pitch in means: to give a particular amount of money in order to help with something Although the mansion was quite big and beautiful, the owner was as poor as a church mouse and had to sell the property to pay off his debts.